Open hole hook wall packer



Nov. 23, 1954 s n- ETAL 2,695,067

OPEN HOLE HOOK WALL PACKER Filed June 6, 1952 3 Sheets-Sheet 2 a 1, wm e\I 4 W w N I. r m E 0 p il N M F HM N AEF m mm M 5 .2 5 f $4 5 4 M. 2 MW 5 0 5 I 97 a 4 8 w f m L w /A W I a. a 9% 9 M, G 5 E m m 8 2 m a 6 W mm C mm E [:1 A-/ A42 g5 A if all [3| 0 El rlzl /F v-\\A .J n m a I)United States Patent 6) ,6 OPEN HOLE HGOK WAL PACKER Joseph-D: Smith;Slire'veport'yha 'a'n'd William B:-T aylor,

Houston, Tex, as'signors' to Johnston Testers- Inc;

Houston, Tex., a corporation of Delaware Application June 6,1952,SerialiN'o: 292,068 4 Claims. 2). 165-438),

Thisinvention relates. to an open liole packer.

A main object-of thepresent invention .is-toprovidean improved open holehook wall-packer.

provide such .a packer retained against outward cammed outwardly intothe well bore by proper telescopic movement of expansion of the packersleeve.

A further object of the .presentrinvention is tOgP I'OVldG a packer asabove described which can.be easily set inan open hole and thencollapse'and then;readilyrersetvin another location.

Various otherobjects of th'e; present;inventionrwill be apparent'fromthe following clescription 'talten in conjunc-a tion' wi th theaccompanyingpdrawings wherein;

Figs- 1a and 1bv disclosein; elevationa packer-em.- bod'ying. theconcepts of the the upper portion of the packer in mid-section, theparts being depicted in running in condition.

Figs. 2a and2b' are views similar .toFigs. 1a and 1b, respectively,butshowing the packer after the dogs have been hooked into the Walls ofthe wellbore.

Figs; 3aand 3b are views similanto-Figs. la iand lb,

respectively, but showing the subsequentistage of opera- 5 tiori wherethe expandable sleeve has-,-been -'expan'detlki'n'to engagementwith thewalls engage the same.

Figs. 4 and 5 are fragmentary views. showing iho'wthev cam edge on thespring sleeve functionsto rotate' thef sleeve during. unsetting of thepacker.-

Referring to the accompanying drawings wherein similar referencecharacters designate similar parts throughout, the packer theredisclosed comprises an upper composite tubular mandrel 11 upper end tothe lower end of a drill string 13, and slidably receiving within itslower portion the upper end of a lower composite tubular mandrel 15.Threadedly connected to the lower end of lower mandrel 15 is an oil welltool generally entitled 16 of any desired type, such as, for instance, aformation fluid tester. The packer functions to sealingly engage thewalls of a well bore and separate the fluid above the packer from thefluid and operations taking place below the packer, or converselyseparating the fluid below the packer from the fluid and operationstaking place above the packer.

The upper end of lower mandrel 15 is keyed to mandrel 11 by keys 17, andcarries a nut 19 which normally rests on a shoulder 21 provided on uppermandrel 11 when the packer is being run into or out of a well. Alsoformed on mandrel 11 is a shoulder 23 for limiting upward movement oflower mandrel 15 relative to the upper mandrel.

Suspended from upper mandrel 11 by a flanged split ring 25 is aresilient packer sleeve 27, which is connected to said split ring 25 bya perforated band 29, the latter being partially embedded in the upperend of the sleeve as is apparent from the drawings. Band 29 and splitring 25 are connected together by inter-engaging flanges formed on theband and ring as disclosed in the drawings, and said split ring andupper mandrel 11 presentinvention, showingv of thezwell bore tosealinglys.

threadedly connected at its V. are likewise connectedby inter-engagingflanges formed on; the ring: and upper mandrel. Sleeve 27 is con;

nected at its lower end-to v-lower mandrel 15 by a similar,

band'31 and a similar split-ring ,33. Split rings Hand 33 are heldtogether by bolts 25a and 33arespectively; the packer sleeve 27 is posi-By theabove construction, tively connected to the lower and uppermandrels to enable positive control over its movements.

It, is apparent that when lower mandrel 15 is held stationary in thewell,- in a manner to be presently explained, sleeve 27 may be expandedinto engagement withtth e. Walls of the well bore by a downward move:mentof drill string 13, which causes a consequent down-- wardf slidingmovement of upper mandrel 11 along lower mandrel 15'to expandsaidsleeve.

For hookinglower mandrel 1 5 to the walls'of the well bore, said mandrelis provided with an enlarged portion; 34 having pivotally mountedthereon a plurality of? dogs 35 by means of pivot mounted for outwardswinging ment with the walls of the well constrained to assume inwardspringsr39 saiddogs.

In their inwardpositions, dogs 35 bear against the upper-taperedend of aspringsleeve 41, which is slidably mounted on the lower reduced end 38*of lower mandrel 15-. ,Sleeve- 41 carries a plurality of bowed springs;43 adapted for frictional engagement with the walls of the well bore. v

Formedin sl'eeye;41 -isan inverted J; slot 45 accommovement intoengagebore, but normally being modating'a screw 47 which is threadedinto lower mandrel 15 J slot..45; is in part defined byan inclined camedge 49 adapted to be; engaged by screw- 47 ismovedupwardly-alongthe,long =sideof slot 47, upon an. upward movement of-lower' mandrel 15relative, to sleeve 41,-to turn sleeve. 41 and" dispose the screw inthe; shorter side of the- J; slot to condition thepacker for furtherdownwardor upward movement inthe well;

In operation-the packer is lowered into the well in the condition-shown,in Figs. 1a; andylb until the packer is located approximately; atthezone-which'it is desired tof set the same. Thedrillstringvisthen'slightly raised to lift screw 47 upwardly a slight amount and the drillstring turned in a direction todispose the screw in the long side of theJ slot while the sleeve 41 is held-againstmovement by; frictionalmembers 43 engaging the bore wall. Thereafter, upon subsequent loweringmovement of -the drill, string, springs,43, being infrictional-engagement with-.the walls of the wellbore, will prevent;downwardmovementof sleeve 41 so-that the dogs '35 are cammed outwardlyby'the upper tapered end 40 of relatively stationary sleeve 41 intohooking engagement with the walls of the well bore. This stage ofoperation is disclosed in Figs. 2a and 2b where it Will be noted thatsleeve 27 is only slightly expanded at this time.

When the dogs take hold, lower mandrel 15 is held stationary so thatupon further downward movement of the drill string, upper mandrel 11moves downwardly relative to the now stationary lower mandrel 15 tocompress sleeve 27 and cause outward expansion thereof into sealingengagement with the well bore Walls. Shoulder 23 serves to limitdownward movement of upper mandrel 11 relative to lower mandrel 15 toprevent damage to the packer by undue compression thereof.

The particular operations or tests to be performed are now commenced.After completion of such tests, when it is desired to collapse thepacker, an upward pull on the upper mandrel 11 serves to collapse sleeve27, and when nut 19 engages shoulder 21, lower mandrel 15 is lifted tolift the dogs 35 out of hooking engagement with the walls of the wellbore and away from (but not out of contact with) the tapered end ofsleeve 41 to allow the dogs to assume inoperative positions under theinfluence of springs 37. During upward movement of lower mandrel 15relative to sleeve 41, screw 47 comes into engagement with cam edge 49as shown in Fig. 4 so that the sleeve is rotatably cammed around todispose the screw into the short side of the J slot as shown in Fig. 5.Thereafter, the drill string may be lowered or raised to dispose thepacker at a new location, at which pins 37, said dogs being positions byleaf or strip? secured to enlarged portion 34' and engaging the packercan be set again by a repetition of the operation above described.

By the present invention, an improved open hole hook wall packer hasbeen provided which can be readily set in a well bore to seal off thezone above the packer from the zone below the packer, and thereafterreadily collapse and reset when and where desired.

While we have shown the preferred form of our invention, it is to beunderstood that various changes can be made in its construction by thoseskilled in out departing from the spirit of the invention as defined inthe appended claims.

Having thus described our invention, what we claim and desire to secureby Letters Patent is:

l. A device of the class scopically arranged upper and lower mandrelsadapted to be suspended from expandable packer sleeve arranged to beexpanded upon contracting telescopic movement of the mandrels, well borewall penetrating means on holding said lower mandrel stationary topermit contracting telescopic movement of the mandrels comprisingpointed dogs pivoted at their upper ends to said lower mandrel, springmeans fastened to said lower mandrel and engaging said dogs forretaining said dogs in an inefiective position, and means for movingsaid penetrating means to an effective position against the resistanceof the restraining means, said last-mentioned means comprising a camsleeve slidably mounted on said lower mandrel and meanson said sleevefor frictionally en- 3- gaging the bore wall.

2. A device of the class described, comprising an upper mandrel havingmeans for connection to a string of drill pipe and telescopicallyreceiving the upper end of a lower mandrel, an expandable packer sleevesecured at its ends to the upper and lower mandrels and adapted to beexpanded upon contracting telescopic movement of the mandrels, well borewall penetrating means on the lower mandrel for tionary to permitcontracting telescopic movement of the mandrels comprising pointed dogspivoted at their upper ends to said lower mandrel, spring means fastenedto said lower mandrel and engaging said dogs for retaining said'dogs inan ineflective position, and means for moving said penetrating means toan effective position against the resistance of the restraining means,said last-mentioned means comprising a cam sleeve slidably mounted a onsaid lower mandrel and means on said sleeve for frictionally engagingthe bore wall.

3 Adevice of the class described, comprising an upper mandrel havingmeans connection'to a string of drillpipe and telescopically receivingthe upper end of a lower mandrel,-an expandable packer sleeve secured atits opposite ends to the upper and lower mandrels and adapted to beexpanded uponthe art withdescribed, comprising telea string of drillpipe and carrying anthe lower mandrel for holding said lower mandrelstaon the upper end thereof for contracting telescopic movement of themandrels, a plurality of "pointed dogs swingingly mounted on the lowermandrel, a sleeve slidably mounted on said lower mandrel below said dogshaving means for frictional engagement with the walls of a well bore andhaving a camming portion at its upper end for camming the dogs outwardlyinto engagement with the walls of the well bore, said sleeve havingformed therein an inverted J slot, and a pin on the lower mandreldisposed in said slot in the shorter leg thereof to restrain said sleeveagainst movement camming said dogs outwardly into engagement with thewalls of the well bore, whereby when said tool is turned relative tosaid sleeve said pin is moved into the longer leg of said J slot andthen may be moved downwardly relative to said sleeve to cam said dogsoutwardly into engagement with the walls of the well bore. 4. A deviceof the class described, comprising an upper mandrel having means on theupper end thereof for connection to a stringof drill pipe andtelescopically receiving the upper end of a lower mandrel, an expandablepacker sleeve secured at its opposite ends to the upper andlowermandrels and adapted to be expanded upon contracting telescopicmovement of the mandrels, a plurality of pointed dogs swingingly mountedon the lower mandrel, a sleeve slidably mounted on said lower mandrelbelow said dogs having means for frictional engagement with the walls ofa well bore and having a cammlng portion at its upper end for cammingthe dogs outwardly into engagement with the walls of the well bore, saidsleeve having formed vtherein an inverted J slot, a pin on the lowermandrel disposed in said slot in the shorter leg thereof to restrainsaid sleeve against movement camming said dogs outwardly into engagementwiththe walls of the well bore, whereby when said tool is turnedrelative to said sleeve said pin is moved into the longer leg of said Jslot and then may be moved downwardly relative to said sleeve to camsaid dogs outwardly into engagement with the walls of the well bore, anda cam defining part of the J slot engageable with said pin when the pinis moved upwardly within the long side of the J slot-to cam said sleevearound to dispose the pin within the short side of said J slot.

References Cited inthe file of this patent H UNITEDSTATES PATENTS NumberPranger May 30, 1939

